Portable, forced air heater runs up to 17 hours on a 100-lb. propane tank to heat up to 4,000 sq. ft. Economical, efficient and clean burning. Piezo continuous ignition for instant heat. High-temperature limit switch. Rugged, durable steel construction. Heater shuts off with loss of flame or power supply. 10' hose and regulator included. 125,000-170,000 BTU.